Add info re: moc-rest dependency to README.
Add info re: moc-rest dependency to README.

SahilTikale/haas,meng-sun/hil,henn/haas,kylehogan/hil,henn/hil,apoorvemohan/haas,lokI8/haas,meng-sun/hil,kylehogan/hil,kylehogan/haas,apoorvemohan/haas,henn/hil_sahil,henn/hil,CCI-MOC/haas,henn/hil_sahil,SahilTikale/switchHaaS